Billed for something which they cant explain

Hi there<br> <br> MTN debited my account in October for a much larger amount than what I am usually charged. When I queried this on 808 they said it was a packet data switch, they said they would send a request for itemised billing on the 02 Nov which I never received. I then enquired again mid Nov and I have still received nothing. I went to MTN's head office in Morningside on Sunday and the consultant confirmed it was for a packet data switch. I found this unbelievable as I purchased a 1GB bolt on the 30th July which expires on the 30 Sep (you get 1GB for free). The data charges were for the month of September which I knew I still had data. The consultant then confirmed that they have changed the expiry date from 60 to 30 days. I have a detailed sms report on what I have purchased as well as expiry dates. I received an sms on the 28th Sep advising that my 1GB bolt will expire in 2 days. I also called 808 again and asked them for some confirmation that was sent to us as clients about the change in expiry date, the consultant said she would send a request to marketing, I still haven't received anything. On the 05 Oct I purchased another 1GB and the consultant said it expires in 60 days.